Between 25-40 mpg in the turbo depending on warp factor engaged.
Alaina, your speedo will under-read quite a bit. It's designed for 145/70r13 tyres and you're running 195/45r15 (if I remember right) so add about 5% on to the mileage it shows between fill-ups.
You'll have to use more throttle to make those big boots turn, so could be the source of the problem - especially if you saw 60mpg with easy driving at the AGM.